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Q:

Cranks but will not start on 1990 GMC 1500 Pickup

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Moved vehicle out of carport,ran fine.After about 2 hrs would not start.Timing is right on,even changed timing chain and cam gear.Plugs are not wet,constantgood fire to plugs.Cranks fine and feels like it will almost start.This has a throttle body,Canadian model with usa emmision standards.
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It should start for a bit if spraying quick start,but it does not.I relpaced the sending unit last summer and the fuel pump tested fine.Now i'am thinking a possible short in the throttle body injectors or wiring or that the starter itself not turning the engine fast enough.
Thank You.